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- /* VMS mapping of data and alloc arena for GNU Emacs.
- Copyright (C) 1986, 1987 Free Software Foundation, Inc.
-
- This file is part of GNU Emacs.
-
- GNU Emacs is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 1, or (at your option)
- any later version.
-
- GNU Emacs is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with GNU Emacs; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
- /* Written by Mukesh Prasad. */
-
- #ifdef VMS
-
- #include "config.h"
- #include "lisp.h"
- #include <rab.h>
- #include <fab.h>
- #include <rmsdef.h>
- #include <secdef.h>
-
- /* RMS block size */
- #define BLOCKSIZE 512
-
- /* Maximum number of bytes to be written in one RMS write.
- * Must be a multiple of BLOCKSIZE.
- */
- #define MAXWRITE (BLOCKSIZE * 30)
-
- /* This funniness is to ensure that sdata occurs alphabetically BEFORE the
- $DATA psect and that edata occurs after ALL Emacs psects. This is
- because the VMS linker sorts all psects in a cluster alphabetically
- during the linking, unless you use the cluster_psect command. Emacs
- uses the cluster command to group all Emacs psects into one cluster;
- this keeps the dumped data separate from any loaded libraries. */
-
- #ifdef __GNUC__
- /* We need a large sdata array because otherwise the impure storage will end up
- in low memory, and this will screw up garbage collection (Emacs will not
- be able to tell the difference between a string length and an address).
- This array guarantees that the impure storage is at a sufficiently high
- address so that this problem will not occur. */
- char sdata[8192] asm("_$$PsectAttributes_NOOVR$$$D$ATA") ;
- char edata[512] asm("_$$PsectAttributes_NOOVR$$__DATA") ;
- #else
- globaldef {"$D$ATA"} char sdata[512]; /* Start of saved data area */
- globaldef {"__DATA"} char edata[512]; /* End of saved data area */
- #endif
-
- /* Structure to write into first block of map file.
- */
-
- struct map_data
- {
- char * sdata; /* Start of data area */
- char * edata; /* End of data area */
- int datablk; /* Block in file to map data area from/to */
- };
-
- static void fill_fab (), fill_rab ();
- static int write_data ();
-
- extern char *start_of_data ();
- extern int vms_out_initial; /* Defined in malloc.c */
-
- /* Maps in the data and alloc area from the map file.
- */
-
- int
- mapin_data (name)
- char * name;
- {
- struct FAB fab;
- struct RAB rab;
- int status, size;
- int inadr[2];
- struct map_data map_data;
-
-
- /* Open map file. */
- fab = cc$rms_fab;
- fab.fab$b_fac = FAB$M_BIO|FAB$M_GET;
- fab.fab$l_fna = name;
- fab.fab$b_fns = strlen (name);
- status = sys$open (&fab);
- if (status != RMS$_NORMAL)
- {
- printf ("Map file not available, running bare Emacs....\n");
- return 0; /* Map file not available */
- }
- /* Connect the RAB block */
- rab = cc$rms_rab;
- rab.rab$l_fab = &fab;
- rab.rab$b_rac = RAB$C_SEQ;
- rab.rab$l_rop = RAB$M_BIO;
- status = sys$connect (&rab);
- if (status != RMS$_NORMAL)
- lib$stop (status);
- /* Read the header data */
- rab.rab$l_ubf = (char *) &map_data;
- rab.rab$w_usz = sizeof (map_data);
- rab.rab$l_bkt = 0;
- status = sys$read (&rab);
- if (status != RMS$_NORMAL)
- lib$stop (status);
- status = sys$close (&fab);
- if (status != RMS$_NORMAL)
- lib$stop (status);
- if (map_data.sdata != start_of_data ())
- {
- printf ("Start of data area has moved: cannot map in data.\n");
- return 0;
- }
- if (map_data.edata != edata)
- {
- printf ("End of data area has moved: cannot map in data.\n");
- return 0;
- }
- fab.fab$l_fop |= FAB$M_UFO;
- status = sys$open (&fab);
- if (status != RMS$_NORMAL)
- lib$stop (status);
- /* Map data area. */
- inadr[0] = (int) map_data.sdata;
- inadr[1] = (int) map_data.edata;
- status = sys$crmpsc (inadr, 0, 0, SEC$M_CRF | SEC$M_WRT, 0, 0, 0,
- fab.fab$l_stv, 0, map_data.datablk, 0, 0);
- if (! (status & 1))
- lib$stop (status);
- }
-
- /* Writes the data and alloc area to the map file.
- */
- mapout_data (into)
- char * into;
- {
- struct FAB fab;
- struct RAB rab;
- int status;
- struct map_data map_data;
- int datasize, msize;
-
- if (vms_out_initial)
- {
- error ("Out of initial allocation. Must rebuild emacs with more memory (VMS_ALLOCATION_SIZE).");
- return 0;
- }
- map_data.sdata = start_of_data ();
- map_data.edata = edata;
- datasize = map_data.edata - map_data.sdata + 1;
- map_data.datablk = 2 + (sizeof (map_data) + BLOCKSIZE - 1) / BLOCKSIZE;
- /* Create map file. */
- fab = cc$rms_fab;
- fab.fab$b_fac = FAB$M_BIO|FAB$M_PUT;
- fab.fab$l_fna = into;
- fab.fab$b_fns = strlen (into);
- fab.fab$l_fop = FAB$M_CBT;
- fab.fab$b_org = FAB$C_SEQ;
- fab.fab$b_rat = 0;
- fab.fab$b_rfm = FAB$C_VAR;
- fab.fab$l_alq = 1 + map_data.datablk +
- ((datasize + BLOCKSIZE - 1) / BLOCKSIZE);
- status = sys$create (&fab);
- if (status != RMS$_NORMAL)
- {
- error ("Could not create map file");
- return 0;
- }
- /* Connect the RAB block */
- rab = cc$rms_rab;
- rab.rab$l_fab = &fab;
- rab.rab$b_rac = RAB$C_SEQ;
- rab.rab$l_rop = RAB$M_BIO;
- status = sys$connect (&rab);
- if (status != RMS$_NORMAL)
- {
- error ("RMS connect to map file failed");
- return 0;
- }
- /* Write the header */
- rab.rab$l_rbf = (char *) &map_data;
- rab.rab$w_rsz = sizeof (map_data);
- status = sys$write (&rab);
- if (status != RMS$_NORMAL)
- {
- error ("RMS write (header) to map file failed");
- return 0;
- }
- if (! write_data (&rab, map_data.datablk, map_data.sdata, datasize))
- return 0;
- status = sys$close (&fab);
- if (status != RMS$_NORMAL)
- {
- error ("RMS close on map file failed");
- return 0;
- }
- return 1;
- }
-
- static int
- write_data (rab, firstblock, data, length)
- struct RAB * rab;
- char * data;
- {
- int status;
-
- rab->rab$l_bkt = firstblock;
- while (length > 0)
- {
- rab->rab$l_rbf = data;
- rab->rab$w_rsz = length > MAXWRITE ? MAXWRITE : length;
- status = sys$write (rab, 0, 0);
- if (status != RMS$_NORMAL)
- {
- error ("RMS write to map file failed");
- return 0;
- }
- data = &data[MAXWRITE];
- length -= MAXWRITE;
- rab->rab$l_bkt = 0;
- }
- return 1;
- } /* write_data */
-
- #endif /* VMS */
-
-